Sash lock for removable sash windows



Feb. 25, 1969 l. H. PHILLIPS SASH LOCK FOR REMOVABLE SASH WINDOWS FiledApril 26, 1967 INVENTOR. 1, III/V6 fl. P/l LL 6 BY #45 4770mm UnitedStates Patent laims ABSTRACT OF THE DISCLOSURE A spring sash balance forremovable sliding sash windows having an automatic sash balance lockingmember actuated by the window when the same is to be removed or pivotedrelative to the mounting sash.

The invention will be best understood by reference to the accompanyingdrawings showing the preferred form of construction and in which:

' FIG. 1 is a perspective view of the locking member of the invention.

FIG. 2 is a plan view of the lock carrier in its unassembled condition.

FIG. 3 is an end elevational view showing the lock and lock carrier intheir preassembled relation.

FIG. 4 is a fragmentary detailed side sectional view showing theinvention in an unlocked position.

FIG. 5 is a side elevational detailed view showing the invention in itslocked position, and

FIG. 6 is a fragmentary detailed sectional view showing the invention inrelation to a window sash and mounting channel.

Referring to FIG. 6 there is shown in section a mounting channel 10 ofthe type that is adapted to be yieldably mounted on the vertical wallsdefining the window opening. It being understood that to either side ofthe window opening there will be complementary mounting channels of theconstruction hereinafter described.

The mounting channel 10 of FIG. 6 includes edge walls 11 and 12 whichterminate into front wall sections 13 and 14, respectively. Formed inthe front wall sections 13 and 14 by recessed side flanges 15 and 16,which flanges terminate into a base wall 17 is an elongated window sashframe guideway 18. Mounted to the rear of the base wall 17 are sidewalls 19 and 20 interconnected with a rear wall 21 so as to form aretaining chamber 22, which extends throughout the elongated length ofthe mounting channel 10.

A vertical edge portion of a window frame 23 provides a tongue 24 whichprojects into the window sash frame guideway 18 so as to be slidablyguided therein. The tongue 24 of the window frame 23 provides anarcuated cam face 25 which bears upon the corner line of junctionbetween the front wall 14 and side flange 16, as seen in FIG. 6.

Carried by the window frame 23 is a pivot and supporting pin 26. Thispin has an insert end 27 which is projected into a suitable aperture 28formed in the window frame 23. It also provides "a circular collar 29which is of a diameter greater than an elongated slot 30 formed in thebase wall 17 of the mounting channel 10. The collar 29 is adapted to bedisposed between the side edge of the window frame 23 and the base wall17 as shown in FIG. 6. The pin 26 provides a trigger end 31 which hasits opposite side edges flattened as at 32 so that the trigger end 31may be projected into the slot 30 as shown in FIGS. 4 and 6.

All of the above identified structural elements are wellknown in the artand make up no part of the present invention except for their functionalrelationship thereto.

As is recognized in the art of removable and tiltable 3,429,071 PatentedFeb. 25, 1969 window sashes, it is required that the sash balancingmember, which in the present instance is indicated as an expendable coilspring 33, be locked in place during the tilting or removing of thewindow frame from the sash mounting. To accomplish this requiredfunction a sash balancing lock member is provided. In the presentinstance the lock 34 comprises a metallic member having a substantiallythin, flat body 35, the top edge portion of which is angularly bent toprovide a top flange 36. The top flange 36 has an extension carried atone end normally bent out of its longitudinal plane, and extendingbeyond the rear edge 37 of the body 35 of the lock 34, forming a lockingcontact element 38. The front edge 39 of the body 35 is recessed as at40 and provides an elongated leg 41 which has its free end bent toextend laterally therefrom so as to lie in a plane transverse to theplane of the top flange 36. This angular end forms a trip finger 42having a cam face 43 tapered downwardly and in the direction of the leg41 as seen in FIGS. 1 and 3.

A lock carrier 44 may be of a one-piece molded construction, preferablyformed from a plastic material. The carrier 44 will include a front wall45, the top edge of which adjacent to one side is recessed as at 46, fora purpose hereinafter made apparent. The front wall 45 has formed on oneface thereof a perpendicularly extending pivot post 47 as well as alocking stud 48 carried by a spacer bearing 49. A spacer bar 50 isprovided adjacent one side edge of wall 45, and lies in substantialhorizontal alignment with the pivot pin 47. The rear wall 51 of thecarrier 44 is connected to the front wall 44 by two spaced apartbendable stirrup members 52. This rear wall 51 is provided with a recess53 which also includes a guide slot 54. The face of the rear wall 51which is adapted to be bent into confronting relation with the one faceof the front wall 45 provides circular recesses 55 and 56 which willreceive the pivot pin 47 and mounting stud 48, respectively, in a mannershown in FIG. 3.

The lock 34 has an aperture 57 formed in the body 35 thereof adapted tohave journaled therein the pivot pin 47 when the carrier is assembled inthe manner described and as shown in FIG. 3. When the lock 34 is soassembled the trip finger 42 will project into the guide slot 54 formedin the rear wall 51 of the carrier 44 as shown in FIGS. 4 and 5.

When the lock 34 is mounted on to the carrier 44 the spring 33 Will haveone end connected to the flange 36 of the lock 34 as seen in FIGS. 4 and5.- When the whole window assembly is completed the pivot and supportpin 26 will project through the slot 30 formed in the mounting channel10 and be inserted in the recesses 46 and 53 formed in the front wall 45and rear wall 51 of the lock carrier 44, and by the weight of the windowwill engage and depress the trip finger 42 so that the same is movedinto the slot 54 formed in the rear wall 51 of the carrier 44 as seen inFIG. 4. This position of the lock 34 is normally against the tension ofthe counter-balancing spring 33 which has a tendency to pivot the lock34 in a clockwise direction about the pivot post 47 provided by the lockcarrier 44 as viewed in FIGS. 4 and 5.

When the window is to be tilted and removed the cam face 25 formed bythe window frame 23 will bear against the mounting channel 10 andresiliently move the same laterally away from the window unit much inthe manner as set forth in United States Letters Patent 2,828,513 issuedApr. 1, 1958.

As the window is tilted the pin 26 will likewise be rotated through itslongitudinal axis such that it will assume the position shown in FIG. 5where, as the pin 26 has rotated the mounting channel 10 has movedlaterally thereof, permitting the insert end 31 of such pin 26 to movedown the cam face 43 of the trip finger 42, permitting the lock 34 to bepivoted in a clockwise direction about pivot post 47 under tension ofthe counter-balancing spring 33 until the locking contact element 38 ofthe top flange 36 frictionally engages the inner surface 58 of the wall20 of the chamber 22 formed on the mounting channel 10. This conditionof the structure is clearly shown in FIG. 5.

Under the locked condition as hereinbefore described the window may beremoved from the window opening while the lock carrier 44, lock 34, andcounter-balancing spring 33 remain in their position longitudinally ofthe mounting channel 10.

When the window is reinserted into the sash the pin 26 will be caused toonce again engage the trip finger 42 so that under the weight of thewindow the lock 34 will be pivoted into its unlocked position as viewedin FIG. 4.

While I have illustrated and described the preferred form ofconstruction for carrying my invention into efliect, this is capable ofvariation and modification without departing from the spirit of theinvention. I, therefore, do

not wish to be limited to the precise details of construction set forth,but desire to avail myself of such variations and modifications as comewithin the scope of the appended claims.

Having thus described my invention, what I claim as new and desire toprotect by Letters Patent is:

1. A lock for a sash balancing member of a tiltable, removable windowhaving a pivotal supporting pin removably mounted in a sash lock carrierslidably contained in one of a pair of resiliently separable opposedchannel sashes with a locking member pivotally mounted in the lockcarrier and connected to one end of the sash balancing member andpivoted in one direction by the force thereof to latch the lock carrieragainst slidable movement through the channel sash wherein theimprovement comprises:

(a) a trip finger carried by and extending perpendicularly to thelocking member and in longitudinal alignment beneath the pivotalsupporting pin, the weight of which when supported on said trip fingeracts to counterweight the pivoting force of the sash balancing member onthe locking member and pivots the same in an opposite direction, and

(b) means provided by said trip finger over which one end of the pivotalsupporting pin laterally moves as it is axially rotated when the windowis tilted so as to be displaced from engagement with the locking memberwhile supported by the lock carrier, permitting the locking member to bepivoted in one direction by the force of the sash balancing member intolocking contact with the channel sash.

2 A lock for a sash balancing member as defined by claim 1 wherein saidmeans over which one end of the pivotal supporting pin laterally movescomprises a cam surface extending inwardly and downwardly in thedirection of the outer end of the pivotal supporting pin.

3. A lock for a sash balancing member as defined by claim 1 wherein thesash lock carrier is of a one-piece construction providing complementarysections foldable into spaced confronting relation and between which ispivotally mounted the locking member, each of said sections providing analigned recess forming a seat for the free end of the pivotal supportingpin, one of said recesses formed in one of said sections having opencommunication with an elongated slot through which movably projects saidtrip finger.

4. A lock for a sash balancing member as defined by claim 3 wherein saidmeans over which one end of the pivotal supporting pin laterally movescomprises a cam surface extending inwardly and downwardly in thedirection of the outer end of the pivotal supporting pin, with said camsurface movable through said elongated slot formed in one of saidsections.

References Cited UNITED STATES PATENTS 2,828,513 4/1958 Nardulli 49l742,987,758 6/1961 Osten 49446 X 3,012,292 12/1961 Brengman 49-4463,124,849 3/1964 Osten 49l74 3,222,733 12/1965 Wahlfeld et a1. 491813,233,278 2/1966 Lundgren 49181 X DENNIS L. TAYLOR, Primary Examiner.

US. Cl. X.R. 16-197

